Milwaukee has just released the human centipede of chargers, it charges six M18 batteries sequentially. That means it charges them one at a time. Compact batteries take 30 min while XC batteries take 60 min. For crews on a job site that use M18 batteries this would be a good charger to have. It can be hung on a wall and has a pass through outlet plug so it does not take up valuable AC outlets. Look for it in January 2013.